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MAINTENANCE
Maintenance of the 3M Brand Professional Audio Recorder will normally
consist of adjustment and repair as needed.
Adjustments are presented in the
Alignment and Adjustment section. This section contains special notes concerning
maintenance and troubleshooting
.
GENERAL PRECAUTIONS
The following paragraphs contain some genera l preca utions which should be
observed when performing maintenance on the recorder.
1.
Do not strike the reversing idler.
It is delicate and located in a
vulnerable position at the front of the mechanism.
If
damaged,
flutter will be excessively high.
2.
Exercise great care in installing head mounting plates
.
They can be
screwed into place with a head lead pinched between the mounting
plate and the transport casting, thus breaking wire insulation or cutting
a head lead.
Be certain no leads will get in the way before instaLLation.
3.
Exercise great care in removing and replacing the mu metal cover
,over the playback head stack.
The slot at the rear of the cover can
slice head lead insulation, thereby grounding head leads or actually
cutting through them.
Be certain that this cover is fully seated so
that the lower lip will not scrape on tape as
it
passes by.
Otherwise
tape edge may be cut and bad tracking over the heads may result.
4.
Do not go from REC. to SAFE when the recorder is operating in the
RECORD mode.
First stop the transport.
This will prevent a thump
from being recorded in the tape and magnetization of
tht,
record head.
5.
Do not remove any of the electronics cards when the power is on.
It
requires only a few seconds to turn off the power, remove a card,
restore power and be ready to operate.
Otherwise
it
is possible to
magnetize a head or damage a meter.
6.
It
is particularly important when moving a
7/9
board from position
9
to position 7 to first turn off the power, then wait about 20 seconds
before removing the board and reinstalling it.
7.
Be certain to remove the power cord from the transport when moving
the recorder
.
This is to ensure that the capstan motor lockout device
will prevent the motor spud from pounding the flywheel.
M64 PAR
2
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